APA

Greenewalt C. H., . (1959). El hombre excepcional. New York: Freedom Fund Library Series.

Chicago

Greenewalt Crawford H, . 1959. El hombre excepcional. New York: Freedom Fund Library Series.

Harvard

Greenewalt C. H., . (1959). El hombre excepcional. New York: Freedom Fund Library Series.

MLA

Greenewalt Crawford H, . El hombre excepcional. New York: Freedom Fund Library Series. 1959.